package com.button.boot.rabbitmq.config;

import org.springframework.amqp.core.Binding;
import org.springframework.amqp.core.BindingBuilder;
import org.springframework.amqp.core.DirectExchange;
import org.springframework.amqp.core.Queue;
import org.springframework.amqp.rabbit.connection.CachingConnectionFactory;
import org.springframework.amqp.rabbit.connection.ConnectionFactory;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.context.annotation.Scope;

@Configuration
public class RabbitMqConfigure {

    @Value("${spring.rabbitmq.host}")
    private String host;

    @Value("${spring.rabbitmq.port}")
    private int port;

    @Value("${spring.rabbitmq.username}")
    private String username;

    @Value("${spring.rabbitmq.password}")
    private String password;

    public static final String EXCHANGE_A = "exchange_A";
    public static final String QUEUE_A = "QUEUE_A";
    public static final String ROUTINGKEY_A = "routingKey_A";

    @Bean
    public ConnectionFactory connectionFactory() {
        CachingConnectionFactory connectionFactory = new CachingConnectionFactory(host, port);
        connectionFactory.setUsername(username);
        connectionFactory.setPassword(password);
        connectionFactory.setVirtualHost("/");
        connectionFactory.setPublisherConfirms(true);
        return connectionFactory;
    }

    @Bean
    @Scope("prototype") // 必须是prototype类型
    public RabbitTemplate rabbitTemplate() {
        return new RabbitTemplate(connectionFactory());
    }

    /**
     * 针对消费者配置 1. 设置交换机类型 2. 将队列绑定到交换机
     * 
     * FanoutExchange: 将消息分发到所有的绑定队列，无routingkey的概念 
     * HeadersExchange ：通过添加属性key-value匹配
     * DirectExchange:按照routingkey分发到指定队列
     * TopicExchange:多关键字匹配
     */
    @Bean
    public DirectExchange defaultExchange() {
        return new DirectExchange(EXCHANGE_A);
    }

    /**
     * 获取队列A
     * 
     * @return
     */
    @Bean
    public Queue queueA() {
        return new Queue(QUEUE_A, true); // 队列持久
    }

    @Bean
    public Binding binding() {
        return BindingBuilder.bind(queueA()).to(defaultExchange()).with(ROUTINGKEY_A);
    }
}
